with \(\int \beta ^2 W_{\rho }(\beta )=1\) .
Here, \({D}_\beta =e^{a^\dag \beta - a \beta ^*}\)  is the displacement operator with a complex amplitude \(\beta \) . Applying Eq. (REF ) to a Fock state gives [1]}
\(W_{n}(\beta )=\frac{2(-1)^n}{\pi } e^{-2|\beta |^2} L_n\left(4|\beta |^2\right)\) 
